ENGINEERING GRAPHICS By R.Nathan Assistant Professor Department of Mechanical Engineering

ENGINEERING GRAPHICS

By R.Nathan

Assistant ProfessorDepartment of Mechanical Engineering

C.R.ENGINEERING COLLEGEAlagarkovil, Madurai - 625301 I - SEMESTER 04.10.2012

UNIT – 2

“PROJECTION OF POINTS”

Engineering Graphics Lecture Notes




QUADRANT

H.P – HORIZONTAL PLANE V.P – VERTICAL PLANE

H.P

V.P



1ST - QUADRANT

ABOVE H.P & INFRONT OF V.P



2ND - QUADRANT

ABOVE H.P & BEHIND V.P



3RD - QUADRANT

BELOW H.P & BEHIND V.P



4TH - QUADRANT

BELOW H.P & INFRONT OF V.P



PROJECTION OF POINTS

A POINT MAY BE SITUATED IN

1.ANY ONE OF THE FOUR QUADRANTS

2.ANY ONE OF THE TWO PLANES

3.BOTH THE PLANES (ie: ON THE XY LINE)





1.ANY ONE OF THE FOUR QUADRANTS

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1.BOTH THE PLANES (ie: on the XY Line)

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PROJECTION OF A POINT SITUATED IN 1ST - QUADRANT

Front View - above XY line Top View - below XY line



PROJECTION OF A POINT SITUATED IN 2nd - QUADRANT

Front View - above XY line Top View - above XY line



PROJECTION OF A POINT SITUATED In 3rd - QUADRANT

Front View - below XY line Top View - above XY line



PROJECTION OF A POINT SITUATED In 4th - QUADRANT

Front View - below XY line Top View - below XY line






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PROJECTION OF POINTS LIES ON H.P



PROJECTION OF POINTS LIES ON V.P



PROJECTION OF POINTS SITUATED IN BOTH THE PLANES



EXAMPLE:- DRAW THE PROJECTIONS OF THE FOLLOWING POINTS ON THE SAME REFERENCE LINE(1)A IN THE H.P AND 20 mm INFRONT THE V.P(2)C IN THE V.P AND 30 mm ABOVE H.P(3)B IN BOTH V.P AND H.P



ANNA UNIVERSITY QUESTIONS

YEAR – JAN 2010 – R2008Draw the projection of the following points on a common reference line.(1)A, on H.P and 35 mm behind V.P(2)B, 5 mm below H.P and 40 mm in front of V.P(3)C, 25 mm above H.P and on V.P

YEAR – JAN 2010 – R2007Mark the projections of the following points on a common reference lines.(1)A, 35 mm behind to V.P and 20 mm below the H.P(2)B, 30 mm in front of the V.P and 30 mm above the H.P(3)C, 40 mm behind the V.P and 10 mm above the H.P(4)D, 45 mm below the H.P and in the V.P(5)E, 35 mm behind the V.P and in the H.P

ENGINEERING GRAPHICS By R.Nathan Assistant Professor Department of Mechanical Engineering

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